From owner-freebsd-net@freebsd.org Tue Feb 6 20:56:14 2018 Return-Path: Delivered-To: freebsd-net@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 5912CF05A0B for ; Tue, 6 Feb 2018 20:56:14 +0000 (UTC) (envelope-from eugen@grosbein.net) Received: from hz.grosbein.net (hz.grosbein.net [78.47.246.247]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "hz.grosbein.net", Issuer "hz.grosbein.net" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id E574B80AAC for ; Tue, 6 Feb 2018 20:56:13 +0000 (UTC) (envelope-from eugen@grosbein.net) Received: from eg.sd.rdtc.ru (root@eg.sd.rdtc.ru [62.231.161.221] (may be forged)) by hz.grosbein.net (8.15.2/8.15.2) with ESMTPS id w16Ku0kN063118 (version=TLSv1.2 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 6 Feb 2018 21:56:01 +0100 (CET) (envelope-from eugen@grosbein.net) X-Envelope-From: eugen@grosbein.net X-Envelope-To: davida@truespeed.com Received: from [10.58.0.4] ([10.58.0.4]) by eg.sd.rdtc.ru (8.15.2/8.15.2) with ESMTPS id w16KttsY030257 (version=TLSv1.2 cipher=DHE-RSA-AES128-SHA bits=128 verify=NOT); Wed, 7 Feb 2018 03:55:55 +0700 (+07) (envelope-from eugen@grosbein.net) Subject: Re: tcpdump filter not functioning correctly with igb on FreeBSD 11.1 To: David Athay , freebsd-net@freebsd.org References: <95AA0EAB-B3D6-4E68-83B2-914894D6FB90@truespeed.com> From: Eugene Grosbein Message-ID: <5A7A1657.4050706@grosbein.net> Date: Wed, 7 Feb 2018 03:55:51 +0700 User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:38.0) Gecko/20100101 Thunderbird/38.7.2 MIME-Version: 1.0 In-Reply-To: <95AA0EAB-B3D6-4E68-83B2-914894D6FB90@truespeed.com> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Spam-Status: No, score=2.2 required=5.0 tests=BAYES_00, LOCAL_FROM, RDNS_NONE autolearn=no autolearn_force=no version=3.4.1 X-Spam-Report: * -2.3 BAYES_00 BODY: Bayes spam probability is 0 to 1% * [score: 0.0000] * 2.6 LOCAL_FROM From my domains * 1.9 RDNS_NONE Delivered to internal network by a host with no rDNS X-Spam-Level: ** X-Spam-Checker-Version: SpamAssassin 3.4.1 (2015-04-28) on hz.grosbein.net X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.25 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 06 Feb 2018 20:56:14 -0000 07.02.2018 0:29, David Athay wrote: > I am running tcpdump -ni igb0 with a filter, and I see some weird results. > > If I use ‘not’ with host or port then it shows only those hosts or ports, and if I don’t use not, and just use host’ or ‘port’ it filters them out as if I had used ‘not’. > > tcpdump -ni igb0 not port 22 > tcpdump: verbose output suppressed, use -v or -vv for full protocol decode > listening on igb0, link-type EN10MB (Ethernet), capture size 262144 bytes > 17:18:08.863067 IP X.X.X.X.22 > Y.Y.Y.Y.50893: Flags [P.], seq 521876235:521876423, ack 2066644163, win 1026, options [nop,nop,TS val 554193435 ecr 716910521], length 188 > 17:18:08.864772 IP Y.Y.Y.Y.50893 > X.X.X.X.22: Flags [.], ack 0, win 23656, options [nop,nop,TS val 716910525 ecr 554193434], length 0 > 17:18:08.866353 IP Y.Y.Y.Y.50893 > X.X.X.X.22: Flags [.], ack 188, win 23651, options [nop,nop,TS val 716910526 ecr 554193435], length 0 > > tcpdump -ni igb0 not host X.X.X.X > tcpdump: verbose output suppressed, use -v or -vv for full protocol decode > listening on igb0, link-type EN10MB (Ethernet), capture size 262144 bytes > 17:20:21.901147 IP X.X.X.X.22 > Y.Y.Y.Y.50893: Flags [P.], seq 521879011:521879199, ack 2066645503, win 1026, options [nop,nop,TS val 554326474 ecr 717043360], length 188 > 17:20:21.902970 IP Y.Y.Y.Y.50893 > X.X.X.X.22: Flags [.], ack 0, win 23656, options [nop,nop,TS val 717043364 ecr 554326472], length 0 > 17:20:21.903364 IP Y.Y.Y.Y.50893 > X.X.X.X.22: Flags [.], ack 188, win 23650, options [nop,nop,TS val 717043364 ecr 554326474], length 0 > > tcpdump -ni igb0 host X.X.X.X > tcpdump: verbose output suppressed, use -v or -vv for full protocol decode > listening on igb0, link-type EN10MB (Ethernet), capture size 262144 bytes > ^C > 0 packets captured > 55 packets received by filter > 0 packets dropped by kernel > > tcpdump -ni igb0 port 22 > tcpdump: verbose output suppressed, use -v or -vv for full protocol decode > listening on igb0, link-type EN10MB (Ethernet), capture size 262144 bytes > ^C > 0 packets captured > 408 packets received by filter > 0 packets dropped by kernel > > Seems to work fine on our FreeBSD 10.3 servers that use igb, and doesn’t happen on FreeBSD 11.1 servers that use bge. > > Can anyone explain what is happening? Please show output of: tcpdump --version uname -aUK